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So I do know all a healer should do and how it works, I just don't know the details and little things that can set you apart from the rest (in a positive way of course ^^)
Anub'Rekhan - Levitate can be a life-saver/damage preventer, just be sure when to use it - if you throw it on yourself as you're still flying up it'll take you a lot longer to get back down again to start up a heal then if you'd throw it just before you land.
Maexxna - Once P2 kicks in, save your PW:S/Pain Suppression until just before a Web Spray.
Noth the Plaguebringer - Mass Dispel > Cripple as long as you can stay at least somewhat grouped up.
Heigan the Unclean - Get the spell slowing aura on you, throw a Penance on the tank and sit back while your character automatically keeps him topped off for the next ~10 seconds. More of a lazyness technique than a 'little thing to set you apart', but hey, we get plenty of activity on other bosses ;)
Loatheb - You too benefit from the crit buff.
Frogger area - Levitate > slime.
Grobbulus - You can dispel yourself once you get in a good spot to drop the cloud, just be sure to remove the buff afterwards.
Gluth - If your addon is accurate in predicting Decimate, just stop healing altogether ~15 seconds before it and shield up the entire raid. Any healing you do is going to be negated by Decimate anyway, shield might save the lives of people on 5%. Also, with about 2 sec to go 'till Decimate, load up a gheal on whoever's tanking so that it lands right after Decimate - follow it up with a Penance. Also, you can use Shackle Undead to CC a zombie or two should you get aggro or if they get close to Gluth.
Thaddius - For the sake of the opposing side, make sure that your tank exits your plateau with full health and if possible a PW:S on him. Also, if you're healing the non-AOE-damage side, have him leave with a ProM to help the other side out a bit.
Sapphiron - Is a lot harder as disc than as holy. If you're not tank healing, keep either PW:S or Renew running on as much people as possible at all times to negate the AOE, and throw your mana regen CD's around freely.
Kel'Thuzad - Shadow Word: Death 1-shots skeletons.
There's a lot more interesting niche things that help in Ulduar and up, but concerning Naxx I think that's pretty much it.